Shaun,

I appreciate the reply with the additional information, and it is useful to some extent.  However, the latest documentation on the scheduler is given in the downloads section is labeled:  DotNetNuke 4.9.0, and it actually contains documentation from a zip version Docs v4.1.1. The doc included for the Scheduler is Version 1.0.0 Last Updated: November 28, 2005. This particular document is out-of-date with what is being delivered and setup by default.   In my case, I found the defaults to be different, and I had to change them to get the scheduler to fire.  By default v04.09.09 has the web config maxThreads set to '1', and there is no setting for the 'enabled' setting.  When this setup is used my events never fired correctly even after an application restart. and the 'Start' 'Stop' command links were greyed out.  I tried using the maxThreads='-1' but it never worked. I changed the maxThreads to '10', and added the enabled='true' setting, and after restarting the application events started firing.

It would really be useful to have whoever is doing the caching code reply to this thread to document the changes that Sebastian mentions.  It may help developers understand the issues more fully.